Specifications

Desk Microphone Connector RJ11
Pin
Number
Signal Notes
1 Telephone select I/p Active Low
2 Ground
3 Microphone I/p
Electret biased 10KΩ
4 PTT Active Low
5 Ground
6 Auxiliary +12vDC Limited to 500 mA ** see note
Handset Connector RJ8
Pin
Number
Signal Notes
1 Microphone -
2 Ear -
3 Ear +
4 Microphone +
Comms Connector DB9F
Pin
Number
Signal Notes
1 N/C
2 TX data Data output from the unit
3 RX data Data input to the unit
4 DTR Data Terminal Ready
5 Ground
6 DSR Data Set Ready
7 N/C
8 N/C
9 TOSC I/p Active low
Record & Playback Connector DB9F
Pin
Number
Signal Notes
1 Auxiliary +12vDC Limited to 500 mA ** see note
2 Tape O/p 0
600Ω balanced
3 Tape I/p 0
600Ω balanced
4 Tape Select I/p Active Low
5 Tape O/p Active Low
6 Ground
7 Tape O/p 1
600Ω balanced
8 Tape I/p 1
600Ω balanced
9 Ground